Core: Allow deserializing PNG savestates with ignoring extdata
Core: Allow deserializing PNG savestates with ignoring extdata

mgba-emu/mgba,Iniquitatis/mgba,mgba-emu/mgba,Iniquitatis/mgba,mgba-emu/mgba,libretro/mgba,Iniquitatis/mgba,libretro/mgba,libretro/mgba,Iniquitatis/mgba,mgba-emu/mgba,libretro/mgba,libretro/mgba